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Time Marches On

Time Marches On. Inside the Restless Earth Chapter 3 Section 5. Q: What is the rock record and geologic time?. A: The rock layers (strata) in the Grand Canyon represent about 2 billion years of Earth’s history.

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Time Marches On

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  1. Time Marches On Inside the Restless Earth Chapter 3 Section 5

  2. Q: What is the rock record and geologic time? • A: The rock layers (strata) in the Grand Canyon represent about 2 billion years of Earth’s history. • D:The Colorado River has cut (weathering and erosion) the canyon in as much as 2km is some areas. • D: The river has been at work for almost 6 million years.

  3. Q: What is the fossil record and the geologic time scale? • A: Fossils of plants and animals are common in the sedimentary rock structures of the Green river in Colorado, Utah, and Wyoming. • D: The rocks were part of a system of lakes for millions of years. • D: Fine-grain sediment preserved delicate structures

  4. Q: What is the fossil record and the geologic time scale?

  5. Q: How is time divided? • A: The geologic time scale in divided into eons, eras, periods, epochs. • D: eon • Hadean (4.6 billion – 3.8 billion year ago) • Archean (3.8 billion – 2.5 billion years ago) • Proterozoic (2.5 billion - 543 million years ago) • Phanerozoic (543 million – present time) • D: Panerozoic eon is divided into three eras • Cenozoic • Mesozoic • Paleozoic

  6. Q: How is time divided?

  7. Q: What does the appearance or disappearance of species mean? • A: Throughout history the number of different species either increased or decreased. • Hallucigenia appeared in the Cambrian period • Other organisms disappeared • Extinction-the death of every member of a species (ex. Dinosaurs)

  8. Q: What is the Paleozoic Era? (543-248 million years ago) Old Life • A: This is the first era represented by fossils and is known as the old life era. • D: Marine (ocean) life flourished • D: Near the end of the era-reptiles began to live on land • D: This era ended with a mass extinction. 90% of all species were killed

  9. Q: What is the Mesozoic Era? (248 years ago) The age of Reptiles • A: This is called the age of reptiles because dinosaurs roamed the land during this time. • Birds and mammals began to evolve • 15%-20% of species went extinct • Climate change or an asteroid caused the extinction

  10. Q: What is the Cenozoic era? (65 million years ago) The Age of Mammals • A: This era is known as the Age of Mammals. • D: Mammals flourished • Regulate body temperature

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